Physical Science Exercise 5

Electric current which is normally produced by generator, where electrically charged particles repeatedly reverse direction, vibrating about relatively fixed positions, is called:

The unit of electric current is called:

Any material having free charged particles that easily flow through it when an electric force acts on it are called:

The flow of electrons through a circuit is called:

Electric current normally produced by chemical reaction (battery), where electrically charged particles are flowing in one direction is called;

The property of a material that resists the the flow of charged particles through it; measured in ohms, is called:

Any material without free charged particles and through which current does not easily flow is called:

A unit of electrical resistance is called:

An atom or molecule which has lost an electron is called:

An electric circuit in which electrical devices are connected in series for the flow of current is called:

Any material with zero electrical resistance, wherein electrons flow without losing energy and without generating heat is called:

Which force binds atoms together to form molecules?

In an electrically neutral atom, the number of protons in the nucleus is equal to the number of:

A positive ion has more:

Strip electrons from an atom and the atom becomes a:

A conductor differs from an insulator in that a conductor:

A main difference between gravitational and electrical force is that electrical force:

The electrical force between charges is strongest when the charges are:

An electron and proton:

An ampere is a unit of electrical:

Alternating current is normally produced by:

Stretch a copper wire so that it is thinner,and the resistance between its ends:

The current through a 10 ohms resistor connected to a 120-V power supply is:

The electric power of a lamp that carries 2A and 120V is:

a 100-W lamp glows brighter than a 25-W lamp. Comparing the two lamps, the electrical resistance of the 100-W lamp must be:

A 60-W bulb is connected to a 120-V plug. What is the current in the light bulb?

The power dissipated in a 4 ohms resistor carrying 3A is:

Compared to the filament thickness of a 60-W light bulb, the filament thickness of 100-W light bulb is:

A power line with a resistance of 2 ohms has a current of 80 A in it. The power dissipated in the line is:

What is the resistance of a 120-W incandescent lamp connected to a 120-V power supply?

A magnet whose field is produced by an electric current is called:

A device that converts electric energy to mechanical energy is called:

The induction of voltage when a magnetic field changes with time is called;

A device that converts mechanical energy to electrical energy is called:

Clustered regions of aligned magnetic atoms are called:

The region of magnetic influence around either a magnetic pole or a moving charged particle is called:

Like kinds of magnetic poles repel, while unlike kinds of magnetic poles:

Magnetism is due to the motion of electrons as they:

Moving electric charges will interact with:

The intensity of cosmic rays bombarding the Earth's surface is largest at the:

Which pole of a compass needle points to a south pole of a magnet?

Electric motor and electric generator are:

Voltage can be induced in a wire by:

The magnetic field strength inside a current-carrying coil will be greater if the coil encloses a:

Metal detectors, like the ones used at airports, are activated by:

Voltage produced by a generator alternates because:

Power is transmitted at higher voltages because the corresponding current in the wire is:

A device that transforms electrical energy to mechanical energy is a:

A transformer actually transforms:

A certain transformer doubles input voltage. If the primary coil has 10A of current, then the current in the secondary coil is:

An ampere is a unit of electrical resistance.

Alternating current is normally produced by a generator.

An electron and proton attract each other.

S tretching a copper wire and making it thinner decreases its resistance.

In a series circuit, a break anywhere in the line stops the flow of charge in all devices in the series.

A negative ion has more electrons than protons

In a given voltage and current, decreasing the resistance in the circuit increases the current.

A positive ion has more electrons than protons.

A negative ion is an atom or molecule which has gained one or more extra electrons.

In electric motor, the input is mechanical energy and the output is electric energy.

In electric generator, the input is mechanical energy and the output is electric energy.

In a step-up transformer, the voltage in the primary coil is higher than in the secondary coil.

North magnetic pole never exists without the presence of south pole and vice versa.

Electromagnets are electrically induced or strengthened magnets.

The spin and revolution of electrons are sources of magnetism.

A magnetic field is created by by the motion of electric charge.

A moving charged particle produces a magnetic field.

An ampere is a unit of electric resistance.

The Earth's magnetic field is strong enough to deflect even cosmic rays coming from the outer space.

The rule of attraction between opposite magnetic poles is similar to that of electric charge.

All magnets have a north pole, but may or may not have a south pole.

Magnetic forces attract and repel without touching

A pair of electrons in an atom, spinning in the same direction, cancel-out magnetism

When a magnet is broken into two, each part will have its north and south poles.

A pair of electrons in atoms, spinning in opposite direction strengthen magnetism.